Which one has the larger standard entropy?
Which substance has the larger standard entropy?
1) 1 mol of P4(g) at 300°C and 0.01 atm versus 1 mol of As4(g) at 300°C and 0.01 atm.
2) 0.5 mol of N2(g) at 298 K in a 20 L volume versus 0.5 mol of CH4(g) at 298 K in a 20 L volume.
I am unsure how to determine which substance is more disordered in each case. Could you please explain the factors that influence standard entropy and how to compare the two scenarios?
1 Answers
standard entropies usually increase with an increase in molar mass, all other things being equal
P4.... S = 218 /mole @....
As4....S =314/mole @....(larger molar mass)
N2...S = 191.5/ mole @....(larger molar mass which increases S)
CH4...S= 186.3 @... ( has more atoms,which increases S),
this would have been hard to call
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